The cells multiply
Identical twins.
Non identical twins.
No, non-identical twins are fraternal twins. They are created when two eggs are fertilized at the same time and become embryos. Identical twins are when a fertilized egg splits into two on its own.
Non-identical twins are when 2 sperm cells fertilize two different eggs during the same pregnancy.
Identical twins
Two egg cells are each fertilized by separate sperm cells.
Yes. Identical twins started out as one egg and one sperm cell and are genetically identical. Fraternal twins come from two eggs and two sperm cells and are no more closely related than any other sibling.
identical twins are from the same egg cell that split, but ferternal twins are from 2 entirely different fertilized egg cells. Thus identical look the same and ferternal can look entirely different.
Yes, in both cases.The mutation causes both of the identical twins to look different from the rest of the family.The mutation causes one of the identical twins to look different from the other twin. That is, the mutation happened shortly after the cells that gave rise to both twins divided.
Identical twins. Although horses sometimes have twins I'm not sure if they have identical twins.
Identical and Fraternal There are identical and fraternal. Fraternal twins happen when 2 different embryos start growing at the same time, so you get a brother and a sister or 2 sisters or 2 brothers that are the same age. Identical twins happen when 1 embryo splits into 2 embryos when it is only a few cells big, so both babies have the same genes.
If they were not then they would not be called identical twins!